Well, I consider myself an 'Amazon bestselling author', because I was an All Star five times.... that meant that I was in the Top 100 selling authors on Amazon for 5 months.
Before that, although my various books hit the Top 100 for their genre (Romance), I didn't call myself bestselling (the BOOKS were bestselling, not ME). That's just my idea of the term, though. I feel that it has to be something quite significant.
I've not heard of all star rankings except in sport--out of curiosity, being a person forced out of desperation to call many of my books "romance" instead of literary, have you had good reviews?
I'd like to read one of your books--could you give us a title?
KDP sends a monthly transactional e-mail to all account holders about KU all stars.
If your book is enrolled in Kindle Select and have over three million pages read in a single month in KU/KOLL, you might qualify for an All Star bonus. Most read author in a month qualifies as well. (Kindle Select)
All Stars are about cumulative pages read in the KU program. In the months that I was in the Top 100 authors, I had between 3.8 and 5 million pages read per month. This was for all my books enrolled in KU.
I haven't been an All Star for a while, because as my name has become more known, I've spent 2017 expanding beyond exclusivity with Amazon (namely iBooks and B&N), and so at this point, only ONE of my books will stay in KU. It's the first book of a new series, and I'll keep it in KU until the first 3 books of the series are released, then I'll start to move out of exclusivity, staggering KU and other platforms so that I get good sales with Amazon, and then again on Apple + B&N. I've systematically removed every other book (I have several complete series at the moment, most of which are out of KU) slowly, over the past @8 months, and the last one is due to 'time out' of KU before Christmas.
I must admit that the All Stars financial benefits kept me exclusive to Amazon for about a year longer than I'd intended, but I'm delighted now to be across various platforms. I took a financial hit for about 4 months, but now my sales on Amazon (hard sales only), Apple and B&N combined more than make up for the KU pages -read that I've lost. It was a risk, but I figured that if it didn't work out, I could always go back to KU. I didn't like having all my eggs in one basket, though, and watching the price per page drop and drop every month.
I'm happy to support you, but I'm not going to share my name or books here.... I'm sorry. I've been on this forum for a while, and I've seen the disdain with which romance writers are treated by some members (because apparently we don't write 'real books'. Eye roll). But we can correspond here, if you wish.